论文标题
Lahx-lady超导体中的Debye温度
Debye temperature in LaHx-LaDy superconductors
论文作者
论文摘要
debye温度，t $ {_θ} $ =（h/2 $π$）/k $ {_ b} $$ω$$_θ$，其中debye频率$ω$ω$Ω$ω$_θ$是全声音频谱的集成特征频率，$α$α$α$ th $α$α$ th 2 $（$ω$）f（$ω$）f（$ω$）。在BCS理论中，t $ {_θ} $与电子偶联强度参数结合使用，$λ$$ _ {e-ph} $，确定超导过渡温度，TC。尽管事实是，电子 - 音波介导的超导性的更准确的理论需要了解完整的声子频谱，$α$$^2 $^2 $（$ω$）F（$ω$）（$ω$）可以非常准确地通过第一原理计算技术来计算，这是没有实验技术可以衡量$α$^2 $ $^$^2 $ $^$ω$（$ω$）F（ （NRT）超导体。因此，$ω$$_θ$仍然是唯一的完整声子频谱的可测量参数，$α$$^2 $（$ω$）F（$ω$）（$ω$），可以通过实验依赖温度依赖性电阻数据（t）的拟合来推导，R（t）与Bloch-Grochneisen方程相关。考虑到在电子 - 音波介导的超导性理论中，应遵守1和2的指定，应遵守下标指定的同位素对应物（或者，在NRT超导体中，在不同压力下具有相同的超导阶段）。 t $ {_θ} _1 $/t $ {_θ} _2 $ = t $ {_ c} _1 $/t $ {_ c} _2 $，有一种方法可以重申/反对NRT超级传导率的电子机制。在本文中，我们在不同的压力下对H3s的阶段以及Lahx-Lady系统中的几个超导体进行分析，并表明实验数据与T $ {_θ} _1 _1 $/t $/t $ {_θ}} _2 $ {_θ} _2 $ = t $ = t $ {_-θ} _2 $ {_ 2 $ {_-θ} _2 $ {_-θ} _2 $ c/c/c/c/c/c/c/c/c/c/c/c/c/c/考虑到最近在H3S-D3S系统中报道了类似的分歧，可以得出结论，NRT超导性的主要起源仍有待发现。
The Debye temperature, T${_θ}$=(h/2$π$)/k${_B}$$ω$$_θ$, where the Debye frequency $ω$$_θ$ is integrated characteristic frequency of full phonon spectrum, $α$$^2$($ω$)F($ω$). In the BCS theory, T${_θ}$ in conjunction with electron-phonon coupling strength parameter, $λ$$_{e-ph}$, determines the superconducting transition temperature, Tc. Despite a fact that more accurate theory of electron-phonon mediated superconductivity requires the knowledge of full phonon spectrum, $α$$^2$($ω$)F($ω$), which can be very accurately computed by first principles calculation technique, there is no experimental technique which can measure $α$$^2$($ω$)F($ω$) in highly-compressed near-room-temperature (NRT) superconductors. Thus, $ω$$_θ$ remains to be the only measurable parameter of full phonon spectrum, $α$$^2$($ω$)F($ω$), which can be deduced by the fit of experimental temperature-dependent resistance data, R(T), to Bloch-Grüneisen equation. Taking in account that within electron-phonon mediated theory of superconductivity two isotopic counterparts (or, in case of NRT superconductors, the same superconducting phase at different pressures), designated by subscripts of 1 and 2, should be obey the relation of T${_θ}_1$/T${_θ}_2$=T${_c}_1$/T${_c}_2$, there is a way to reaffirm/disprove the electron-phonon mechanism of NRT superconductivity. In this paper, we perform the analysis for R3m-phase of H3S at different pressure, as well as for several superconductors in LaHx-LaDy system and show that there is a large disagreement between experimental data and T${_θ}_1$/T${_θ}_2$=T${_c}_1$/T${_c}_2$. Taking in account that similar disagreement has recently reported in H3S-D3S system, it can be concluded that primary origin for NRT superconductivity remains to be discovered.
